Square-bottom paper bag



Feb 19 1924e D; APPEL- SQUARE BOTTOM PAPER BAG Filed Nov.

2 Sheets-Sheet 1 :Qwmd

Feb. 19 1924.

D. APPEL SQUARE BOTTOM PAPER BAG Filed Nov. 17 1919 2 Sheets-Sheet Patented Feb. 19, 1924.

UNITE stars i: E F

DANIEL APPEL, OF CLEVELAND HEIGHTS, OHIO, ASSIGNOR 'IO THECLEVELAIID- AKRON BAG COMPANY, OF CLEVELAND, OHIO, A CORPQRATICNOE OHIQ. I

SQUARE-BOTTOM PAPER BAG. 1

Application filed November 17, 1919. Serial No. 338,711.

1 '0 flZZwhOT/L it may concern:

Be it known that I, DANIEL APPEL, a c tizen of the United States, residing at Cleveland Heights, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Square-Bottom .Paper Bags, of which the following is a .full, clear, and exact description.

This invention relates to certain improvements in square bottom paper bags, and to the process of producing the same.

The principal objects of the invention are, first, to so construct the bags that they may he produced rapidly and with little strain and economically, and, secondly, to prov de abag which is eflicient, easily filled with material, and has a bottom of double thickness, smoothly pasted on the inside, and safely sealed. A further object of the inven tion is to provide a bag, which when opened, especially by a dip of air, presents a square, open mouth which is non-collapsing so that the bag can be more readily and conveniently filled.

as consisting in certain novel details ofconstruction, and in the stepsof the improved method, all of which are illustrated in the accompanying drawings, are described in the following specification, .and set forth in the appended claims.

7 In the drawings wherein I have shown two slightly different embodiments of the invention, of which I will first describe the preferred construction, Fig. 1 is a plan view of a bellows folded blank paper tube from which the bag is formed; Fig.1 is an end view of the same with the tube very slightly opened to show the bellows fold; Fig. 2 is showing particularly the bottom portion slightly opened to show the slits that are provided along the four longitudinal edges in the bottom portion, both Figs. 1 and 2 showing by dotted lines certain fold lines;

Fig. .2 is a perspective view showing. the bottomforming flaps in the process of spreading while one of the flaps is being folded and turned over against the body of the tube 1 on the line A, A; F ig; 3 is a plan view after the bottom forming flaps have been opened.

The invention may be briefly summarized.

a fragmentary perspective view of the same,

view with the side, flaps folded inwardly;

Fig. 5 is a diagrammatic view with the end flap-s slightly bent upward. to illustrate the lines of fold of the end, flaps, the lines of fold being such that portions of thelnow infolded side flaps are folded overtogether with the end flaps; Fig. 6 is a View similar to' Fig. 4 with one of the'end flaps folded and pasted down on the infolded side flaps Fig. 7 is a similar view with the other end flap folded inward and pasted onto the side flaps and onto thepreviouslyinfolded end. flap, this view showing the bag in its completed form; Fig. 8' is a .view similar to Fig. 3, illustrating the manner in which the paste is preferably applied when the bag is formed-in accordance with a'slight modifi cation wherein the end flaps are folded inwardly and pasted upon each other prior to the inward folding of the side flaps; Fig. 9

is a similar View with the endflaps folded inward and pasted in position, and showing paste applied to the side flaps; F ig, 10 is a similar view with the bag completed by the infolding and pasting of the side flaps; Fig. 11 is a perspective view of the completed bag fully opened and ready for filling; Fig. .12 is a fragmentary, longitudinal central sectional view of Fig. 11, showing theposition that the bellows folds assume when the bag is fullyopened so as to prevent collapsing, and Fig. 18 is a perspective view of the lower portion of the bag showing how the bottom is extended on all four sides when the bag is filled. r

In carrying out my invention I provide a flattened bellows sided or plicated tube 10, with two broad sides 10 10 and inner bellows folded portions or side plies 10 10", this tube having outer longitudinal edges or lines of fold 10 and inner lines of foldlO.

The portion of the tube which is designed to form the bottom of the bag is now slit along. its longitudinal outer edges for a distance about equal to the depth of the side plies, as shown at 11.

Then the upper broad side flap of the tube is folded back upon the body of the tube along the line A, A, in the manner illustrated in Fig. 2 to the position shown in Fig. 3. The bellows portions at the slit end of the tube are thereby spread or unfolded outwardly and flattened. By spreadingthe bellows folds laterally, there are formed end flaps 12 and 13, and side flaps 14 and 15, together with what are well known as inside triangles 16, the latter being continuations of the side flaps.

When all the parts are opened in the manner illustrated in Fig. 3, paste is applied in order that the flaps may now be folded inward and pasted. The lines on which the paste is applied depends upon whether the side flaps or end flaps are first folded inwardly. With the preferred form of the invention wherein the side flaps are first folded inward, paste is applied substantially as illustrated in Fig. 3, there being a continuous band of paste 17, extending from the free end ofthe end flap 13 up along its margin, across the base of the triangle 16, up to the free end of the side flap 12, across its free end, and down the opposite side across the base of the opposite triangle 16 to the free end of end flap'13. Likewise, a band of paste is provided'on end flap 12, asshown at 18, and two bands of paste areapplied on end flap 13, as shown at 19.

Then the side flaps are folded inwardly as shown in Fig. 4, and pasted down, the lines of fold coinciding with the outer longitudinal side edges of the tube. In this folding and pasting operation it is to be noted that the inner portions, of the side flaps and the bases of the triangles 16 are pasted together for the full width of the side flaps, as shown at 20. This isan important feature in connection with others to be referred to subsequently.

Then the end flaps are folded over and pasted down flatly on the side flaps as shown in Figs. 6 and 'Z to complete the bag.

It is an important feature of this invention, particularly in its association with the sealing of the side flaps for their full width along-"the bases of the'triangles 16, that in folding the end flaps inward in the manner just stated, the lines of fold be not at the side edges of the side flaps, but inward of the same substantially along the lines B, B and C, C of Fig. 4L. In other words, it is an important characteristic of the invention that the marginal portions of the now infolded side flaps be folded inward with the end flaps forming sealing laps 21 in the side flaps of a width equal substantially to the widthof the pasted band 20 of the side flaps and bases of the inner triangles 16.

This results in a bag with a perfectly sealed bottom due in large measure to the pasted bands 20 by which the inner portions of the side flaps are pasted for their full width to the base portions of the inner triangles 16, and due to the laps 21 along the margins of the side flaps. Furthermore, the construction provides uniform distribution of material resulting in an exceedingly strong bottom. Not only do the pasted bands 20 and laps 21 of the side flaps cause a perfectly sealed bottom, but they provide reinforcements at the margins of the bottom along all four sides of the bag.

It will be observed that in lapping over the marginal portions 21 of the side flaps, and in pasting the inner portions of the side flaps to the bases of the triangles 16, as shown at 20, the cross-section of the bottom of the bag when opened is reduced on all sides. This leaves a surplus of paper in the bellows folds which bulges outward when the bag is opened as by a dip of air, and therefore effectively prevents thecollapsing 0f the bag. This outward bulge which is indicated at 22 in Fig. 12, extends from the corners of the bottom of the bag upward on both sidesof the triangle 16 with the .maximum bulge on the center line of the side plies well up toward the top of the bag, thus forming a lock or brace which holds the bag full open and prevents collapsing.

Though the cross-section of the bottom is somewhat reduced by the pasted sections 20 of the side flaps and by the sealing laps 21 of the side flaps, when the bag is opened, on filling the bag it will extend thebottom outward on all four sides and absorb the surplus of the bulging material until it is equalto the cross-section of the body of the bag. Thus when the bag is. first opened, the bottom of the bag has what may be termed temporary bottom lines, but when the bag is filled the bottom is extended to what may be termed the permanent bottom lines. It will be seen therefore, that the bottom of the bag has developed fold lines on its endufiaps, these coinciding with the lines of fold B, B, and QC, on which the end flaps are folded inwardly in forming the bag, and has undeveloped but predetermined fold lines in its side flaps, these undeveloped fold lines being the inner margins of the pasted bands 20.

The modification illustrated in Figs. 8, 9- and 10 differs from the preferred form already described, only in the manner in which the paste is applied, and in the order in which the flaps are folded inwardly. A bellows sided paper tube having its four outer edges slit in the manner already described, is employed', and the slit bottom is opened up so as to form the end flaps 12 and 13, and side flaps 14 and 15 with their inner triangles 16 precisely as in the first instance. Paste is now applied across the free edge and along the sides, of end flap 12, as shown at 24 in Fig. 8, and along the sides of end flap 13, as shown at 25 in the same figure. Then the end flaps and portions of the side flaps are folded inward along the lines D, D and E, E of Fig. 8, the flap. 13

first being folded onto and pasted to the triangles 16 of the side flaps, and then the flap 12 being folded over and pasted down. The partially completed bag now appears as shown in Fig. 9, the side portions of the side flaps 14 and 15 now being'lapped over as shown at 26 in Fig. 9.

It should be noted that when the end flaps in the modification are thus folded inwardly and pasted, the marginal portions of the end flaps are pasted onto the bases of the triangles 16, producing reinforced pasted sec tions designated 27 in Fig. 9, of substantially the width of the laps 26, and corresponding to the pasted sections 20 ofthe bag first described. 7

Then by a second pasting operation, paste is applied along the outer free edges and along the laps 26 of the side flaps as shown at 28 in Fig. 9, and then the bag is completed by folding the side flaps inwardly and pasting them down flatly on the end flaps, as shown in Fig. 10. This bag is in every way as good as the bag first described, but it requires an additional pasting operation to produce it. the first method is preferred.

I am aware that attempts have been made by others to devise a bag having a construction somewhat similar to the bags herein described, but all these in one respect or another were defective to an extent which rendered them of no practical utility.

l/Vhile I have shown the preferred form and a slight modification in the bag, and the preferred ways in which these bags are produced, I do not wish to be confined to the precise details shown, but aim in my claims to cover all modifications or changes which do not involve a departure from the spirit and scope of my invention in its broadest aspects.

Having described my invention, I claim:

1. A paper bag of the class described, having a bottom formed by overlying pasted flaps which are continuations of the four sides of the bag, two of the flaps having their outer marginal portions pasted for their full width to the adjacent portions of the sides of which said flaps are continuations.

2. A paper bag having two broad and two bellows folded or plicated sides,.the bottom of the bag being formed by flaps which are pasted together and constitute continuations of the sides, the plicated sides each having a band or section next to the bottom pasted to the latter for the full width of the bag.

3. A paper bag of the class described, having two plicated sides and having its bot-.

Hence the bag produced by their marginal edges lapped overf'and the lowerportions of theplicated sides having bands orsections pasted to certain flaps of v the bottom for the full width ofthe bag.

5. A paper, bag having a flat bottom of less dimensions than the cross section of the 7 bag when opened, and having developed temporary fold lines alongtwo of its sides, and temporary but undeveloped fold lines in its other two sides over which the four sides of the bagspread and unfold the bottom on' developed fold lines extending transversely across the plicated sides, and retired or inset from the outer edges of the bag.

7. A paper bag having two broad sides and two plicated sides, and a fiat bottom formed of overlapping flaps which are continuations of the four sides, and having an addition to the double thickness formed thereby integral reinforced edges on all four sides.

8. A paper bag having two broad sides and two plicated sides and a flat bottom formed of overlapping flaps which are continuations of the'four sides, and having in addition to the double thickness formed thereby reinforced edges on all four sides, the reinforcements on two of the sides being formed by the lower portions of the plicated sides pasted to the bottom.

9. A paper bag having two broad sides and two plicated sides and a flat bottom formed by overlapping flaps which are continuations of the four sides, said bottom be ing of smaller dimensions than the body of the bag when opened and having reinforced edges on all four sides.

10. A paper bag having two broad sides and two plicated sides, and a flat bottom formed by infolded and pasted flaps which are continuations of the sides of the bag, said bottom having reinforcements along all four sides formed by lapped portions of two of the flaps and by pasted bands by which the bottom is pasted to the lower portions of the plicated sides.

11.. A paper bag comprising a body portion and a bottom consisting of infolded and pasted flaps which are continuations of the sides of the body, twoof the flaps having their marginal portions lapped over upon themselves to form sealing laps and the same flaps having their outer portions pasted for the full width of said flaps to the adjacent portions of the sides ofthe bag body.

12. A paper bag comprising a bag body having two broad sides and two plicated sides and also a flat bottom, there being defrom its. edges and terminating at the first named fold lines. 7

'13,. A paper bag having a body portion composed of two broad sides and two plioated sides and-having also a flat bottom,

there being developed bottom fold lines extending across the broad sides and predetermined but undeveloped fold lines extending crosswise of the bottom inward from the edges of the latter and terminating in the first named fold lines, said fold lines as specified forming in the side plies: when the bag is opened a surplus of material which bulges outward the side plies from the bottom corners upward to a maximum bulge at the center of the side plies so as to hold the bag fully open and prevent collapsing,

In testimony whereof, I hereunto allix my signature. V

DANIEL APPEL. 

